ABAP Select data from SAP table V_TA20NRHS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TA20NRHS table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to V_TA20NRHS. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the V_TA20NRHS table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_V_TA20NRHS TYPE STANDARD TABLE OF V_TA20NRHS,
      WA_V_TA20NRHS TYPE V_TA20NRHS,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <V_TA20NRHS> TYPE V_TA20NRHS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_TA20NRHS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_TA20NRHS
  INTO TABLE IT_V_TA20NRHS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TA20NRHS
*  INTO TABLE @DATA(IT_V_TA20NRHS2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_V_TA20NRHS INDEX 1 INTO DATA(WA_V_TA20NRHS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_TA20NRHS ASSIGNING <V_TA20NRHS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TA20NRHS>-MANDT = 1.
<V_TA20NRHS>-HOTEL_ID = 1.
<V_TA20NRHS>-RATECODE = 1.
<V_TA20NRHS>-ROOMTYPE = 1.
<V_TA20NRHS>-BEDTYPE = 1.

ENDLOOP.

LOOP AT IT_V_TA20NRHS INTO WA_V_TA20NRHS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TA20NRHS-ENDDA, sy-vline,
  WA_V_TA20NRHS-BEGDA, sy-vline,
  WA_V_TA20NRHS-CORP_DISC, sy-vline,
  WA_V_TA20NRHS-PUSE, sy-vline,
  WA_V_TA20NRHS-DISCTYPE, sy-vline,
  WA_V_TA20NRHS-DISCPERCENT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TA20NRHS you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_V_TA20NRHS TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_V_TA20NRHS INTO WA_V_TA20NRHS.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_V_TA20NRHS_STR, 
MANDT TYPE STRING,
HOTEL_ID TYPE STRING,
RATECODE TYPE STRING,
ROOMTYPE TYPE STRING,
BEDTYPE TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
CORP_DISC TYPE STRING,
PUSE TYPE STRING,
DISCTYPE TYPE STRING,
DISCPERCENT TYPE STRING,
DISCAMOUNT TYPE STRING,
CURRENCY TYPE STRING,
KTEXT TYPE STRING,
NAME TYPE STRING,
STRASSE TYPE STRING,
STRASSE2 TYPE STRING,
LAND1 TYPE STRING,
PLZ TYPE STRING,
ORT TYPE STRING,
ORTSTEIL TYPE STRING,
LANDX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TA20NRHS_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_V_TA20NRHS_STR-MANDT sy-vline 
WA_V_TA20NRHS_STR-HOTEL_ID sy-vline 
WA_V_TA20NRHS_STR-RATECODE sy-vline 
WA_V_TA20NRHS_STR-ROOMTYPE sy-vline 
WA_V_TA20NRHS_STR-BEDTYPE sy-vline 
WA_V_TA20NRHS_STR-ENDDA sy-vline 
WA_V_TA20NRHS_STR-BEGDA sy-vline 
WA_V_TA20NRHS_STR-CORP_DISC sy-vline 
WA_V_TA20NRHS_STR-PUSE sy-vline 
WA_V_TA20NRHS_STR-DISCTYPE sy-vline 
WA_V_TA20NRHS_STR-DISCPERCENT sy-vline 
WA_V_TA20NRHS_STR-DISCAMOUNT sy-vline 
WA_V_TA20NRHS_STR-CURRENCY sy-vline 
WA_V_TA20NRHS_STR-KTEXT sy-vline 
WA_V_TA20NRHS_STR-NAME sy-vline 
WA_V_TA20NRHS_STR-STRASSE sy-vline 
WA_V_TA20NRHS_STR-STRASSE2 sy-vline 
WA_V_TA20NRHS_STR-LAND1 sy-vline 
WA_V_TA20NRHS_STR-PLZ sy-vline 
WA_V_TA20NRHS_STR-ORT sy-vline 
WA_V_TA20NRHS_STR-ORTSTEIL sy-vline 
WA_V_TA20NRHS_STR-LANDX sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.